Advertisements
Advertisements
Question
When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance quickly spreads in the entire room. Name the process involved in this.
Solution
Diffusion is the process by which the smell of a lighted incense stick spreads in the entire room.
APPEARS IN
RELATED QUESTIONS
Tabulate the differences in the characteristics of states of matter.
Give a reason for the following observation.
Naphthalene balls disappear with time without leaving any solid.
Name the physical state of matter which can be easily compressed.
Give two reasons to justify that Water is a liquid at room temperature.
What does the diffusion of gases tell us about their particles?
Why does a gas exert pressure?
When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment :
The substance X normally exists in a physical state which can flow easily but does not fill its vessel completely. It also turns anhydrous copper sulphate blue. When substance X is cooled excessively, it changes into a substance Y which has a fixed shape as well as a fixed volume. If, however, the substance X is heated strongly, it changes into a substance Z which has neither a fixed shape nor a fixed volume.
- Name the substances (i) X (ii) Y and (iii) Z.
- What is the process of conversion of X into Y known as ?
- At which temperature X gets converted into Y ?
- What is the process of conversion of X into Z known as ?
- At which temperature X gets converted into Z ?
Which of the following is false for gases?
 |
|
| Fig. I | Fig. II |
In figure-I, an air column of length ℓ1 is entrapped by a column of Hg of length 8 cm. In figure-II length of same air column at the same temperature is ℓ2. The `ℓ_1/ℓ_2` is:
(1 atm = 76 cm of Hg)
